Karmic beliefs, centered on the expectation of ethical causation within and across lifetimes, appear in major world religions as well as spiritual movements around the world, yet they remain an underexplored topic in psychology. In three studies, we assessed the psychological predictors of Karmic beliefs among participants from culturally and religiously diverse backgrounds, including ethnically and religiously diverse students in Canada, and broad national samples of adults from Canada, India, and the United States (total N = 8,996). Belief in Karma is associated with, but not reducible to, theoretically related constructs including belief in a just world, belief in a moralizing God, religious participation, and cultural context. Belief in Karma also uniquely predicts causal attributions for misfortune. Together, these results show the value of measuring explicit belief in Karma in cross-cultural studies of justice, religion, and social cognition.